M10 machines have the letters DQ in the serial numbers. For example, 123DQ678.
On the top backside of the M10, you can see the Z motor as well as a small boxed enclosure with the fan-guard pointing out towards the side.
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M11 machines have the letters DR in the serial numbers. For example, 123DR678.
On the top backside of the M11, there is a larger boxed enclosure. The fan-guard is on the back, and has 3 small windows to see the LED’s inside.
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